Rio Salado CHM 130 Midterm Objectives Exam Questions With Accurate Answers 100% Pass.

science that studies the composition of substances and the way they interact with other substances. - correct answers Chemistry 1. Observation 2. Hypothesis 3. Experiment 4. Conclusion - correct answers Steps of the Scientific Method Length (meter), Volume (liter), Mass (gram), Temp. (C), Time (second) - correct answers Metric system Length (meter), Volume (cubic meter), Mass (kilogram), Temp. (kelvin), Time (second) - correct answers SI system a coefficient, a power of 10, and a unit of measurement. (Ex. 8.6 x 10-4 g) - correct answers Scientific Notation numbers you obtain when you measure a quantity using a measuring tool - correct answers Measured Number are all the digits including the estimated digit. All nonzero numbers are counted as significant figures. - correct answers Significant Figures numbers obtained by counting items or using a definition that compares two units in the same measuring system. - correct answers Exact Numbers 1 000 - correct answers Kilo- 1 000 000 - correct answers mega- 0.1 - correct answers deci- 0.01 - correct answers centi- 0.001 - correct answers milli- 0.000 001 - correct answers micro- An equality written as a fraction. - correct answers Conversion Factors mass/volume (Ex. 68 g/9.5 mL) - correct answers Density the material that makes up a substance and has mass and occupies space - correct answers Matter A type of matter composed of elements and compounds that has a definite composition - correct answers Pure substance the physical combination of two or more substances that does not change the identities of the mixed substances - correct answers Mixture Elements are pure substances containing only 1 type of matter, which cannot be broken down by chemical methods. Compounds are our substances that contain 2 or more elements, with a definite composition, the can be broken down to simpler substances only by chemical methods. - correct answers Elements vs. Compounds the composition of the substance in the mixture is uniform (ex. air, seawater) - correct answers Homogeneous mixture the components of the mixture are visible (ex. oil and water) - correct answers Heterogeneous mixture can be observed or measured without affecting the identity of the substance. - correct answers Physical properties indicate the ability of a substance to change to a new substance - correct answers Chemical properties a change during which the original substance is converted into a new substance that has a different composition and new chemical and physical properties. - correct answers Chemical change a change in which the physical properties of a substance change without and change in its identity - correct answers Physical change Celsius + 273 - correct answers Kelvin (F-32)/1.8 - correct answers Celsius